I have an early 2015 Retina Macbook Pro 13" i5/256gb ssd. The computer is great, but over the last few weeks, my bluetooth service keeps showing as "Bluetooth: Not Available." Whenever this happens, it also screws up my USB ports to the point that they don't recognize anything. I've reset the SMC a few times to fix the problem, but I am really getting annoyed with it. OS X is 10.10.5 Any tips to permanently fix the issue (other than taking it to an Apple "genius" bar)?